I need that thing he used on his mom.
Without analyzing everything and just sticking to answering the question. Hell yeah, sex is an important part of a relationship, and having sex with a person who isn't taking part in it and just letting u do what u want to their body feels weird and unsettling and I'd be more comfortable just watching porn and jerking off to it than screwing an unresponsive body. So hell yeah, I would totally bring up that conversation with her about having sex with other people and continuing the relationship that way. Also having sex with her and knowing she's faking all interest is just a buzzkill, since love making is a way to make two people closer and that result is dead in the water when it's just lies
Quieres lamerme el pito
her fucks. too much
Recall the Ex is a flake -- the husband divorced her for a reason. And the non-job in Australia, and becoming homeless -- are more examples of the flakiness in action. Don't assume the husband wants the Ex back -- this is unlikely. He may be fantasizing about what life could have been like if she weren't a flake, and they could go back in time, but he knows she still is.